how to get image src from other website using asp.net

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C#

ASP.NET

image

HtmlDocument

HtmlDocument document = new HtmlDocument();
document.Load("url");

foreach (HtmlNode image in document.DocumentElement.SelectNodes("//img[@src"))
{
    HtmlAttribute url = image["src"];
    imageUrls.Add(url.Value);
}

i m using this code but it is not working on asp.net it's required System.windows.form namespace but i want to do this on my asp.net webpage